Free and total cortisol levels in semelparous and iteroparous chinook salmon |
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| Authors: | T. P. Barry,¶ M. J. Unwin,&dagger J. A. Malison, T. P. Quinn,&Dagger |
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| Affiliation: | University of Wisconsin Aquaculture Program, 1605 Linden Drive, Madison, WI 53706, U.S.A.;National Institute of Water and Atmospheric Research Ltd, Box 8602, Christchurch, New Zealand;University of Washington, School of Aquatic and Fishery Sciences, Box 355020, Seattle, WA 98195, U.S.A. |
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| Abstract: | Total cortisol, free cortisol and percent free cortisol were all significantly higher in semelparous male chinook salmon Oncorhynchus tshawytscha than in iteroparous and immature fish. The findings suggest that the regulation of both total and free cortisol concentrations may play key roles in mediating the post-spawning death of semelparous Pacific salmon. |
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| Keywords: | cortisol iteroparous reproduction salmon semelparous |
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